Well if I'm going to dispel their stoneskins, I might as well just implode their bodies with a simple backstab and not bother with the poison [img]smile.gif[/img]
Arrows of Dispelling are very nice though. Don't know how my now retired Swashbuckler would've handled the improved Liches if it hadn't been for them. Also, for that reason alone, it's actually a good thing they're +2 enchanted.
There's a nice stash of 80 Arrows of Dispelling available right out of Irenicus dungeon if one is a thief, which is usually enough for the whole of SoA, and a fair bit of ToB as well if one is careful not to waste them.
Poison stacking. Ah yes, I'm expecting quite a bit from this when I dual to a fighter and combine Coated weapon with GWW